Hi Salvatore,
Greetings from Syncfusion support,
We have validated your reported query. Based on the shared information of SfSpinner query, the SfSpinner can be used as an waiting popup for an asynchronous call or until fetching data from databases.
If possible, can you please share us an minimal sample reproducing your issue scenario ?. So that we can check the possibilities of integrating the SfSpinner and provide you an solution.
Regards,
Indrajith